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Situated in the townlands of Tuaim / Toome and Raithnigh / Ranny in the parish of Lettermacaward. This unusual name is a compound of trosc and sliabh. The meaning of the first element is unclear, but it may relate to rock or the barrenness of the landscape. It is found in a handful of names scattered along the west coast and in Co. Antrim. It is not the word trosc meaning 'cod' as suggested by P.W. Joyce.
Troscshliabh is the 1432th highest place in Ireland. Troscshliabh is the second most southerly summit in the Donegal NW area. Linkback: https://mountainviews.ie/summit/1322/

Thanks for posting that walk. Been back that network of boreens, found a court tomb and early inscribed cross, but didn't know about that trig pillar. Sounds like a much better walk than the one to Croaghleconnell trig piller (next one NE in Derryleconnell Near). For that one you need wellies the whole way to near the summit. Had hard showers the whole way. Nice view also, but looking forward to Toome! Go raibh matih agat. Linkback: https://mountainviews.ie/summit/1322/comment/17904/